Cylindrical Roller Bearings are designed to carry heavy radial loads and are manufactured in different designs relating to the configuration of the flanges which provide the guides for the rolling elements.

LLRJ, MMRJ - Two flanges on the outer ring, no flanges on the inner ring.

XLRJ, LRJ, MRJ - Two flanges on the inner ring, no flanges on the outer ring.

XLRJA, LRJA, MRLA - Two flanges on the inner ring, one flange on the outer ring.

The cage material is denoted by either a "J" for steel cage or "M" for brass cage.